built to protect china from invaders, it's incredibly long. in fact, it would stretch back and forth across the u.s. more than four times. >> we are in the pearl tea house, and right now, we are taking part in a traditional tea ceremony. >> they also sampled all kinds of foods, from the famous peking duck... to fried scorpions on a stick. yum. and they wandered through the marketplaces. >> i got lost in a chinese mall. [ chuckles ] and i only knew my host sister's english name, so i kept going around, going, "chloe zai nar?", which is like, "where is chloe?" and everyone was like, "i don't know who you're talking about." >> there was a lot that was wonderfully strange and a lot that was strangely familiar. >> and when i got to stay with a chinese family and see, like, what their daily routine is like and going to school and seeing that there's a lot more similarities than i thought between our two cultures. >> china was a lot more open than i expected. i expected it to be a lot -- you know, a lot more police and, like, a "government presence"